noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A device that rotates a telescope so as to keep its orientation constant with relation to the stars.
2. 2
   optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror wordnet

Synonyms

All synonyms

observatoryplanetariumreflectorrefractorspectrographspectroscope

Etymology

Related to Latin coelestis (“sky”), corrupted form of caelestis, + -stat.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.